The perimeter formula for the original PRST rectangle is: P = 2x + 2y To find the perimeter formula of the rectangle P'R'S'T we must use the scale factor and substitute in each dimension. We have then: P '= 2 (3x) +2 (3y) Rewriting: P '= 6x + 6y P '= 6 (x + y) Answer: An equation for the perimeter of P'R'S'T is: P '= 6 (x + y)
This should be pretty self explanatory. "miles per hour" is how many miles you can drive in 60 minutes. So, it would take....an hour to reach 80 miles. You're going 80 miles per hour.
